Deuteronomy 5:15

Remember that you were a slave in the land of Egypt, and that the LORD your God brought you out of there with a mighty hand and an outstretched arm. That is why the LORD your God has commanded you to keep the Sabbath day.

And remember that thou wast a servant in the land of Egypt, and that the LORD thy God brought thee out thence through a mighty hand and by a stretched out arm: therefore the LORD thy God commanded thee to keep the sabbath day.